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박용규 ( Park Yong-kyu ),주은희 ( Joo Eun-hi ),이건철 ( Lee Gon-cheol ),변항용 ( Byun Hang-yong ),우종완 ( Woo Jong-wan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
This study investigates the strain properties of cement mortar and concrete. The test showed the elasticity modulus of cement mortar indicated 1.6~2.6(×10<sup>4</sup>MPa) and that of concrete exhibited 1.8~2.7(×10<sup>4</sup>MPa). The elasticity modulus became smaller, as the mixture proportion, W/C ratio and fluidity increased. The mortar exhibited two times bigger value of length strain ratio than concrete, and the increase of mixture proportion and W/C ratio resulted in growth of strain ratio. Moreover, higher shrinkage-reducing was shown, as slump flow and slump increase. Thermal expansion coefficients of mortar was 10~13.4με/℃ and that of concrete was 9~11με/℃, respectively. An increase of mixture proportion and W/C ratio provided the high thermal expansion coefficients, but increase of slump flow and slump did not possibly affect the thermal expansion coefficients.
박용규(Park Yong-Kyu),주은희(Joo Eun-Hi),이건철(Lee Gon-Cheol),변항용(Byun Hang-Yong),우종완(Woo Jong-Wan),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
This study investigates the strain properties of cement mortar and concrete. The test showed the elasticity modulus of cement mortar indicated 1.6~2.6(×10⁴㎫) and that of concrete exhibited 1.8~2.7(×10⁴㎫). The elasticity modulus became smaller, as the mixture proportion, W/C ratio and fluidity increased. The mortar exhibited two times bigger value of length strain ratio than concrete, and the increase of mixture proportion and W/C ratio resulted in growth of strain ratio. Moreover, higher shrinkage-reducing was shown, as slump flow and slump increase. Thermal expansion coefficients of mortar was 10~13.4με/℃ and that of concrete was 9~11με/℃. respectively. An increase of mixture proportion and W/C ratio provided the high thermal expansion coefficients, but increase of slump flow and slump did not possibly affect the thermal expansion coefficients.
회수수에 당류계 안정화제를 처리한 시멘트 모르터의 특성
金虎林,우종완,한민철,류현기,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
In this paper, fundamental properties of cement mortar using recycled water with stabilizing agent are discussed in order to investigate the applicability of recycled water. Stabilizing agent content, solid contents and open time are varied in this paper. For fresh mortar properties, highest fluidity with 0.15% of stabilizing agent was observed and air content was increased with an increase in stabilizing agent contents. Solid contents and open time of recycled water had nothing to do with fluidity and air content loss. Little difference in setting time was found with the presence of stabilizing agent and without, while it was accelerated with an increase in open time and solid content. For strength properties, the highest strength value was observed at 0.15% of stabilizing agent. An increase in solid contents resulted in an enhancement of strength, while strength decreased with an increase in open time and elapse of age. Drying shrinkage exhibited a reduction with an increase in stabilizing agent contents and open time. From the present paper, the combination of 0.15% of sacharic based stabilizing agent, 3% of solid content and 1day of open time is found to be an optimal condition to perform effectively.
회수수에 처리되는 당류계 안정화제의 혼입률 변화가 콘크리트의 품질에 미치는 영향
文學龍,金虎林,우종완,한민철,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The objective of present paper is to investigate the engineering properties of concrete using recycling water incorporating saccharic based stabilizing agent in order to improve qualities of concrete in the region of normal strength and high strength. According to test results, fluidity and air content do not exhibit significant difference with an increase in stabilizing agent contents. Bleeding was not observed at 30% of W Ie, regardless of stabilizing agent contents, nonetheless, concrete with stabilizing agent of 0.15% was observed to occur the least bleeding at 40 and 50% of W IC. For setting time, although presence of recycled water accelerates setting time, setting time shows to be retarded gradually with an increase in stabilizing agent content. For compressive strength, use of stabilizing agent enhanced compressive strength of concrete compared with that of concrete without stabilizing agent. In the side of strength enhancement, adequate dosage of stabilizing agent is found to be 0.15%. As dosage of stabilizing agent increased above 0.15%, drying shrinkage exhibited a tendency to decrease.